单项选择题
Before the telephone was ______ , man had no way of talking to each other except face to face.
A．invented
B．discovered
C．installed
D．created
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单项选择题
The waiter at the restaurant handed them a menu ______ they could place an order.
A．in that
B．now that
C．so that
D．that
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单项选择题
I agree with him ______ , but not entirely.
A．until a certain point
B．to some point
C．to some extent
D．until a certain extent
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